2026-07-072026-07-07http://salesiana.dossiersoluciones.com/handle/123456789/21571This paper has been withdrawn by the authors, because we had probably observed some spurious intensity with x=0.29 sample (Fig.3(b)). This came out after further studies of the detailed x-dependence of the highest energy LO phonon branch in LSCO.This paper has been withdrawn by the authorsSuperconductivityStrongly Correlated Electronstext